WHILE IN HEAVY, SLOW MOVING TRAFFIC, A CAR STOPPED ABRUPTLY IN FRONT OF ME. I SLAMMED ON MY BRAKES BUT MY CAR SEEMED TO ACCELERATE. I HAD LEFT SPACE BETWEEN OUR VEHICLES BUT THE CAR KEPT MOVING FORWARD AND I HIT THE VEHICLE IN FRONT OF ME CAUSING SEVERAL THOUSAND DOLLARS OF DAMAGE. THIS IS THE SECOND OCCURRENCE.